<!DOCTYPE html>
<html>
<style>
html, body { margin: 0; padding: 0; }
</style>
<body>
<div style="position:relative">
<canvas id="output" width="300" height="300"></canvas>
</div>
<script>
var canvas = document.getElementById('output');
var ctx = canvas.getContext('2d');
ctx.rotate(10 * Math.PI / 180);
ctx.fillStyle = 'blue';
ctx.fillRect(90, 30, 90, 90);
</script>
</body>
</html>
